Our aim in this project is to critically evaluate the effects of a novel music therapy intervention on the symptoms of PTSD. Estimates developed by the Global Burden of Disease Study reveal that mental illness accounts for over 15% of the burden of disease on health and productivity in established market economies--more than the disease burden caused by all cancers combined.[1] Perhaps no industry has had the burden of mental disorders affect its labor force as severely and pervasively as the Armed Forces.